A polythene piece rubbed with wool is found tohave a negative charge of 3 × 10−7C.
(a) Estimatethe number of electrons transferred (from which to which?)
(b) Isthere a transfer of mass from wool to polythene?
A polythene piece rubbed with wool is found tohave a negative charge of 3 × 10−7C.
(a) Estimatethe number of electrons transferred (from which to which?)
(b) Isthere a transfer of mass from wool to polythene?
(a) When polythene is rubbed against wool, a number ofelectrons get transferred from wool to polythene. Hence, wool becomespositively charged and polythene becomes negatively charged.
Amountof charge on the polythene piece, q = −3 × 10−7C
Amountof charge on an electron, e = −1.6 × 10−19C
Numberof electrons transferred from wool to polythene = n
ncan be calculated using the relation,
q= ne
= 1.87 × 1012
Therefore,the number of electrons transferred from wool to polythene is 1.87 ×1012.
(b) Yes.
Thereis a transfer of mass taking place. This is because an electron hasmass,
me= 9.1 × 10−3 kg
Totalmass transferred to polythene from wool,
m= me × n
= 9.1 × 10−31 × 1.85 × 1012
= 1.706 × 10−18 kg
Hence,a negligible amount of mass is transferred from wool to polythene.
(a) When polythene is rubbed against wool, a number ofelectrons get transferred from wool to polythene. Hence, wool becomespositively charged and polythene becomes negatively charged.
Amountof charge on the polythene piece, q = −3 × 10−7C
Amountof charge on an electron, e = −1.6 × 10−19C
Numberof electrons transferred from wool to polythene = n
ncan be calculated using the relation,
q= ne
= 1.87 × 1012
Therefore,the number of electrons transferred from wool to polythene is 1.87 ×1012.
(b) Yes.
Thereis a transfer of mass taking place. This is because an electron hasmass,
me= 9.1 × 10−3 kg
Totalmass transferred to polythene from wool,
m= me × n
= 9.1 × 10−31 × 1.85 × 1012
= 1.706 × 10−18 kg
Hence,a negligible amount of mass is transferred from wool to polythene.
